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  <div class="section" id="module-htmllib">
<span id="htmllib-a-parser-for-html-documents"></span><h1>19.3. <a class="reference internal" href="#module-htmllib" title="htmllib: A parser for HTML documents. (deprecated)"><tt class="xref py py-mod docutils literal"><span class="pre">htmllib</span></tt></a> &#8212; A parser for HTML documents<a class="headerlink" href="#module-htmllib" title="Permalink to this headline">¶</a></h1>
<p class="deprecated">
<span class="versionmodified">Deprecated since version 2.6: </span>The <a class="reference internal" href="#module-htmllib" title="htmllib: A parser for HTML documents. (deprecated)"><tt class="xref py py-mod docutils literal"><span class="pre">htmllib</span></tt></a> module has been removed in Python 3.</p>
<span class="target" id="index-0"></span><p id="index-1">This module defines a class which can serve as a base for parsing text files
formatted in the HyperText Mark-up Language (HTML).  The class is not directly
concerned with I/O &#8212; it must be provided with input in string form via a
method, and makes calls to methods of a &#8220;formatter&#8221; object in order to produce
output.  The <a class="reference internal" href="htmlparser.html#module-HTMLParser" title="HTMLParser: A simple parser that can handle HTML and XHTML."><tt class="xref py py-class docutils literal"><span class="pre">HTMLParser</span></tt></a> class is designed to be used as a base class
for other classes in order to add functionality, and allows most of its methods
to be extended or overridden.  In turn, this class is derived from and extends
the <tt class="xref py py-class docutils literal"><span class="pre">SGMLParser</span></tt> class defined in module <a class="reference internal" href="sgmllib.html#module-sgmllib" title="sgmllib: Only as much of an SGML parser as needed to parse HTML. (deprecated)"><tt class="xref py py-mod docutils literal"><span class="pre">sgmllib</span></tt></a>.  The
<a class="reference internal" href="htmlparser.html#module-HTMLParser" title="HTMLParser: A simple parser that can handle HTML and XHTML."><tt class="xref py py-class docutils literal"><span class="pre">HTMLParser</span></tt></a> implementation supports the HTML 2.0 language as described
in <span class="target" id="index-2"></span><a class="rfc reference external" href="http://tools.ietf.org/html/rfc1866.html"><strong>RFC 1866</strong></a>.  Two implementations of formatter objects are provided in the
<a class="reference internal" href="formatter.html#module-formatter" title="formatter: Generic output formatter and device interface."><tt class="xref py py-mod docutils literal"><span class="pre">formatter</span></tt></a> module; refer to the documentation for that module for
information on the formatter interface.</p>
<p>The following is a summary of the interface defined by
<a class="reference internal" href="sgmllib.html#sgmllib.SGMLParser" title="sgmllib.SGMLParser"><tt class="xref py py-class docutils literal"><span class="pre">sgmllib.SGMLParser</span></tt></a>:</p>
<ul>
<li><p class="first">The interface to feed data to an instance is through the <tt class="xref py py-meth docutils literal"><span class="pre">feed()</span></tt> method,
which takes a string argument.  This can be called with as little or as much
text at a time as desired; <tt class="docutils literal"><span class="pre">p.feed(a);</span> <span class="pre">p.feed(b)</span></tt> has the same effect as
<tt class="docutils literal"><span class="pre">p.feed(a+b)</span></tt>.  When the data contains complete HTML markup constructs, these
are processed immediately; incomplete constructs are saved in a buffer.  To
force processing of all unprocessed data, call the <tt class="xref py py-meth docutils literal"><span class="pre">close()</span></tt> method.</p>
<p>For example, to parse the entire contents of a file, use:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">parser</span><span class="o">.</span><span class="n">feed</span><span class="p">(</span><span class="nb">open</span><span class="p">(</span><span class="s">&#39;myfile.html&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">read</span><span class="p">())</span>
<span class="n">parser</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
</pre></div>
</div>
</li>
<li><p class="first">The interface to define semantics for HTML tags is very simple: derive a class
and define methods called <tt class="xref py py-meth docutils literal"><span class="pre">start_tag()</span></tt>, <tt class="xref py py-meth docutils literal"><span class="pre">end_tag()</span></tt>, or <tt class="xref py py-meth docutils literal"><span class="pre">do_tag()</span></tt>.
The parser will call these at appropriate moments: <tt class="xref py py-meth docutils literal"><span class="pre">start_tag()</span></tt> or
<tt class="xref py py-meth docutils literal"><span class="pre">do_tag()</span></tt> is called when an opening tag of the form <tt class="docutils literal"><span class="pre">&lt;tag</span> <span class="pre">...&gt;</span></tt> is
encountered; <tt class="xref py py-meth docutils literal"><span class="pre">end_tag()</span></tt> is called when a closing tag of the form <tt class="docutils literal"><span class="pre">&lt;tag&gt;</span></tt>
is encountered.  If an opening tag requires a corresponding closing tag, like
<tt class="docutils literal"><span class="pre">&lt;H1&gt;</span></tt> ... <tt class="docutils literal"><span class="pre">&lt;/H1&gt;</span></tt>, the class should define the <tt class="xref py py-meth docutils literal"><span class="pre">start_tag()</span></tt> method; if
a tag requires no closing tag, like <tt class="docutils literal"><span class="pre">&lt;P&gt;</span></tt>, the class should define the
<tt class="xref py py-meth docutils literal"><span class="pre">do_tag()</span></tt> method.</p>
</li>
</ul>
<p>The module defines a parser class and an exception:</p>
<dl class="class">
<dt id="htmllib.HTMLParser">
<em class="property">class </em><tt class="descclassname">htmllib.</tt><tt class="descname">HTMLParser</tt><big>(</big><em>formatter</em><big>)</big><a class="headerlink" href="#htmllib.HTMLParser" title="Permalink to this definition">¶</a></dt>
<dd><p>This is the basic HTML parser class.  It supports all entity names required by
the XHTML 1.0 Recommendation (<a class="reference external" href="http://www.w3.org/TR/xhtml1">http://www.w3.org/TR/xhtml1</a>).   It also defines
handlers for all HTML 2.0 and many HTML 3.0 and 3.2 elements.</p>
</dd></dl>

<dl class="exception">
<dt id="htmllib.HTMLParseError">
<em class="property">exception </em><tt class="descclassname">htmllib.</tt><tt class="descname">HTMLParseError</tt><a class="headerlink" href="#htmllib.HTMLParseError" title="Permalink to this definition">¶</a></dt>
<dd><p>Exception raised by the <a class="reference internal" href="htmlparser.html#module-HTMLParser" title="HTMLParser: A simple parser that can handle HTML and XHTML."><tt class="xref py py-class docutils literal"><span class="pre">HTMLParser</span></tt></a> class when it encounters an error
while parsing.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.4.</span></p>
</dd></dl>

<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<dl class="last docutils">
<dt>Module <a class="reference internal" href="formatter.html#module-formatter" title="formatter: Generic output formatter and device interface."><tt class="xref py py-mod docutils literal"><span class="pre">formatter</span></tt></a></dt>
<dd>Interface definition for transforming an abstract flow of formatting events into
specific output events on writer objects.</dd>
<dt>Module <a class="reference internal" href="htmlparser.html#module-HTMLParser" title="HTMLParser: A simple parser that can handle HTML and XHTML."><tt class="xref py py-mod docutils literal"><span class="pre">HTMLParser</span></tt></a></dt>
<dd>Alternate HTML parser that offers a slightly lower-level view of the input, but
is designed to work with XHTML, and does not implement some of the SGML syntax
not used in &#8220;HTML as deployed&#8221; and which isn&#8217;t legal for XHTML.</dd>
<dt>Module <a class="reference internal" href="#module-htmlentitydefs" title="htmlentitydefs: Definitions of HTML general entities."><tt class="xref py py-mod docutils literal"><span class="pre">htmlentitydefs</span></tt></a></dt>
<dd>Definition of replacement text for XHTML 1.0  entities.</dd>
<dt>Module <a class="reference internal" href="sgmllib.html#module-sgmllib" title="sgmllib: Only as much of an SGML parser as needed to parse HTML. (deprecated)"><tt class="xref py py-mod docutils literal"><span class="pre">sgmllib</span></tt></a></dt>
<dd>Base class for <a class="reference internal" href="htmlparser.html#module-HTMLParser" title="HTMLParser: A simple parser that can handle HTML and XHTML."><tt class="xref py py-class docutils literal"><span class="pre">HTMLParser</span></tt></a>.</dd>
</dl>
</div>
<div class="section" id="htmlparser-objects">
<span id="html-parser-objects"></span><h2>19.3.1. HTMLParser Objects<a class="headerlink" href="#htmlparser-objects" title="Permalink to this headline">¶</a></h2>
<p>In addition to tag methods, the <a class="reference internal" href="htmlparser.html#module-HTMLParser" title="HTMLParser: A simple parser that can handle HTML and XHTML."><tt class="xref py py-class docutils literal"><span class="pre">HTMLParser</span></tt></a> class provides some
additional methods and instance variables for use within tag methods.</p>
<dl class="attribute">
<dt id="htmllib.HTMLParser.formatter">
<tt class="descclassname">HTMLParser.</tt><tt class="descname">formatter</tt><a class="headerlink" href="#htmllib.HTMLParser.formatter" title="Permalink to this definition">¶</a></dt>
<dd><p>This is the formatter instance associated with the parser.</p>
</dd></dl>

<dl class="attribute">
<dt id="htmllib.HTMLParser.nofill">
<tt class="descclassname">HTMLParser.</tt><tt class="descname">nofill</tt><a class="headerlink" href="#htmllib.HTMLParser.nofill" title="Permalink to this definition">¶</a></dt>
<dd><p>Boolean flag which should be true when whitespace should not be collapsed, or
false when it should be.  In general, this should only be true when character
data is to be treated as &#8220;preformatted&#8221; text, as within a <tt class="docutils literal"><span class="pre">&lt;PRE&gt;</span></tt> element.
The default value is false.  This affects the operation of <tt class="xref py py-meth docutils literal"><span class="pre">handle_data()</span></tt>
and <a class="reference internal" href="#htmllib.HTMLParser.save_end" title="htmllib.HTMLParser.save_end"><tt class="xref py py-meth docutils literal"><span class="pre">save_end()</span></tt></a>.</p>
</dd></dl>

<dl class="method">
<dt id="htmllib.HTMLParser.anchor_bgn">
<tt class="descclassname">HTMLParser.</tt><tt class="descname">anchor_bgn</tt><big>(</big><em>href</em>, <em>name</em>, <em>type</em><big>)</big><a class="headerlink" href="#htmllib.HTMLParser.anchor_bgn" title="Permalink to this definition">¶</a></dt>
<dd><p>This method is called at the start of an anchor region.  The arguments
correspond to the attributes of the <tt class="docutils literal"><span class="pre">&lt;A&gt;</span></tt> tag with the same names.  The
default implementation maintains a list of hyperlinks (defined by the <tt class="docutils literal"><span class="pre">HREF</span></tt>
attribute for <tt class="docutils literal"><span class="pre">&lt;A&gt;</span></tt> tags) within the document.  The list of hyperlinks is
available as the data attribute <tt class="xref py py-attr docutils literal"><span class="pre">anchorlist</span></tt>.</p>
</dd></dl>

<dl class="method">
<dt id="htmllib.HTMLParser.anchor_end">
<tt class="descclassname">HTMLParser.</tt><tt class="descname">anchor_end</tt><big>(</big><big>)</big><a class="headerlink" href="#htmllib.HTMLParser.anchor_end" title="Permalink to this definition">¶</a></dt>
<dd><p>This method is called at the end of an anchor region.  The default
implementation adds a textual footnote marker using an index into the list of
hyperlinks created by <a class="reference internal" href="#htmllib.HTMLParser.anchor_bgn" title="htmllib.HTMLParser.anchor_bgn"><tt class="xref py py-meth docutils literal"><span class="pre">anchor_bgn()</span></tt></a>.</p>
</dd></dl>

<dl class="method">
<dt id="htmllib.HTMLParser.handle_image">
<tt class="descclassname">HTMLParser.</tt><tt class="descname">handle_image</tt><big>(</big><em>source</em>, <em>alt</em><span class="optional">[</span>, <em>ismap</em><span class="optional">[</span>, <em>align</em><span class="optional">[</span>, <em>width</em><span class="optional">[</span>, <em>height</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#htmllib.HTMLParser.handle_image" title="Permalink to this definition">¶</a></dt>
<dd><p>This method is called to handle images.  The default implementation simply
passes the <em>alt</em> value to the <tt class="xref py py-meth docutils literal"><span class="pre">handle_data()</span></tt> method.</p>
</dd></dl>

<dl class="method">
<dt id="htmllib.HTMLParser.save_bgn">
<tt class="descclassname">HTMLParser.</tt><tt class="descname">save_bgn</tt><big>(</big><big>)</big><a class="headerlink" href="#htmllib.HTMLParser.save_bgn" title="Permalink to this definition">¶</a></dt>
<dd><p>Begins saving character data in a buffer instead of sending it to the formatter
object.  Retrieve the stored data via <a class="reference internal" href="#htmllib.HTMLParser.save_end" title="htmllib.HTMLParser.save_end"><tt class="xref py py-meth docutils literal"><span class="pre">save_end()</span></tt></a>. Use of the
<a class="reference internal" href="#htmllib.HTMLParser.save_bgn" title="htmllib.HTMLParser.save_bgn"><tt class="xref py py-meth docutils literal"><span class="pre">save_bgn()</span></tt></a> / <a class="reference internal" href="#htmllib.HTMLParser.save_end" title="htmllib.HTMLParser.save_end"><tt class="xref py py-meth docutils literal"><span class="pre">save_end()</span></tt></a> pair may not be nested.</p>
</dd></dl>

<dl class="method">
<dt id="htmllib.HTMLParser.save_end">
<tt class="descclassname">HTMLParser.</tt><tt class="descname">save_end</tt><big>(</big><big>)</big><a class="headerlink" href="#htmllib.HTMLParser.save_end" title="Permalink to this definition">¶</a></dt>
<dd><p>Ends buffering character data and returns all data saved since the preceding
call to <a class="reference internal" href="#htmllib.HTMLParser.save_bgn" title="htmllib.HTMLParser.save_bgn"><tt class="xref py py-meth docutils literal"><span class="pre">save_bgn()</span></tt></a>.  If the <a class="reference internal" href="#htmllib.HTMLParser.nofill" title="htmllib.HTMLParser.nofill"><tt class="xref py py-attr docutils literal"><span class="pre">nofill</span></tt></a> flag is false, whitespace is
collapsed to single spaces.  A call to this method without a preceding call to
<a class="reference internal" href="#htmllib.HTMLParser.save_bgn" title="htmllib.HTMLParser.save_bgn"><tt class="xref py py-meth docutils literal"><span class="pre">save_bgn()</span></tt></a> will raise a <a class="reference internal" href="exceptions.html#exceptions.TypeError" title="exceptions.TypeError"><tt class="xref py py-exc docutils literal"><span class="pre">TypeError</span></tt></a> exception.</p>
</dd></dl>

</div>
</div>
<div class="section" id="module-htmlentitydefs">
<span id="htmlentitydefs-definitions-of-html-general-entities"></span><h1>19.4. <a class="reference internal" href="#module-htmlentitydefs" title="htmlentitydefs: Definitions of HTML general entities."><tt class="xref py py-mod docutils literal"><span class="pre">htmlentitydefs</span></tt></a> &#8212; Definitions of HTML general entities<a class="headerlink" href="#module-htmlentitydefs" title="Permalink to this headline">¶</a></h1>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The <a class="reference internal" href="#module-htmlentitydefs" title="htmlentitydefs: Definitions of HTML general entities."><tt class="xref py py-mod docutils literal"><span class="pre">htmlentitydefs</span></tt></a> module has been renamed to <tt class="xref py py-mod docutils literal"><span class="pre">html.entities</span></tt> in
Python 3.  The <a class="reference internal" href="../glossary.html#term-to3"><em class="xref std std-term">2to3</em></a> tool will automatically adapt imports when
converting your sources to Python 3.</p>
</div>
<p><strong>Source code:</strong> <a class="reference external" href="http://hg.python.org/cpython/file/2.7/Lib/htmlentitydefs.py">Lib/htmlentitydefs.py</a></p>
<hr class="docutils" />
<p>This module defines three dictionaries, <tt class="docutils literal"><span class="pre">name2codepoint</span></tt>, <tt class="docutils literal"><span class="pre">codepoint2name</span></tt>,
and <tt class="docutils literal"><span class="pre">entitydefs</span></tt>. <tt class="docutils literal"><span class="pre">entitydefs</span></tt> is used by the <a class="reference internal" href="#module-htmllib" title="htmllib: A parser for HTML documents. (deprecated)"><tt class="xref py py-mod docutils literal"><span class="pre">htmllib</span></tt></a> module to
provide the <a class="reference internal" href="#htmlentitydefs.entitydefs" title="htmlentitydefs.entitydefs"><tt class="xref py py-attr docutils literal"><span class="pre">entitydefs</span></tt></a> attribute of the <a class="reference internal" href="htmlparser.html#module-HTMLParser" title="HTMLParser: A simple parser that can handle HTML and XHTML."><tt class="xref py py-class docutils literal"><span class="pre">HTMLParser</span></tt></a> class.  The
definition provided here contains all the entities defined by XHTML 1.0  that
can be handled using simple textual substitution in the Latin-1 character set
(ISO-8859-1).</p>
<dl class="data">
<dt id="htmlentitydefs.entitydefs">
<tt class="descclassname">htmlentitydefs.</tt><tt class="descname">entitydefs</tt><a class="headerlink" href="#htmlentitydefs.entitydefs" title="Permalink to this definition">¶</a></dt>
<dd><p>A dictionary mapping XHTML 1.0 entity definitions to their replacement text in
ISO Latin-1.</p>
</dd></dl>

<dl class="data">
<dt id="htmlentitydefs.name2codepoint">
<tt class="descclassname">htmlentitydefs.</tt><tt class="descname">name2codepoint</tt><a class="headerlink" href="#htmlentitydefs.name2codepoint" title="Permalink to this definition">¶</a></dt>
<dd><p>A dictionary that maps HTML entity names to the Unicode codepoints.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.3.</span></p>
</dd></dl>

<dl class="data">
<dt id="htmlentitydefs.codepoint2name">
<tt class="descclassname">htmlentitydefs.</tt><tt class="descname">codepoint2name</tt><a class="headerlink" href="#htmlentitydefs.codepoint2name" title="Permalink to this definition">¶</a></dt>
<dd><p>A dictionary that maps Unicode codepoints to HTML entity names.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.3.</span></p>
</dd></dl>

</div>


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  <h3><a href="../contents.html">Table Of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#">19.3. <tt class="docutils literal"><span class="pre">htmllib</span></tt> &#8212; A parser for HTML documents</a><ul>
<li><a class="reference internal" href="#htmlparser-objects">19.3.1. HTMLParser Objects</a></li>
</ul>
</li>
<li><a class="reference internal" href="#module-htmlentitydefs">19.4. <tt class="docutils literal"><span class="pre">htmlentitydefs</span></tt> &#8212; Definitions of HTML general entities</a></li>
</ul>

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